I'm having this issue, too. Here are three workarounds:

Here are three workarounds:

1) Log out before closing your laptop lid. Your screen should start
normally when you log in next.

2) If after opening your laptop and logging in you get a black screen,
open TTY1 by pressing

CTRL + ALT + F1.

At the prompt, log in with your name and password. Then type:

sudo service lightdm restart

Log in one more time and your screen should be restored.

3) If after opening your laptop and logging in you get a black screen,
use a keyboard shortcut to open a terminal (You'll be doing this with a
blank screen, so type carefully!):

Super + t

Then type:

xrandr -- auto

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https://bugs.launchpad.net/bugs/1259339

Title:
  Xfce4 Power Manager does not restore screen power

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